You finish the quiz at 11 p.m., screenshot your four letters, and send them to the group chat.
Two months later you take it again. One letter has flipped.
So which result was you? If that has happened to you, the problem probably isn't you. It's what the test was built to do. The short version: the Big Five scores you on five traits along a scale, and research supports it more strongly. The MBTI sorts you into one of 16 types, and it is best used as a prompt for self-reflection rather than a verdict. The rest of this piece explains why, and how to use either one without handing it your identity.
What are you actually comparing?
Two different designs, not two versions of the same thing.
The MBTI describes four preference pairs: Extraversion or Introversion, Sensing or Intuition, Thinking or Feeling, Judging or Perceiving. Psychology Today describes how those pairs combine into 16 types. You get a label.
The Big Five works differently. It gives you a continuous score on five traits: Neuroticism, Extraversion, Openness, Conscientiousness and Agreeableness. You get a profile, a set of positions on five dimensions, not a box to sit in.
The same Psychology Today piece frames the MBTI as a theory-driven preference typology, while the Big Five is an empirically developed trait taxonomy. That one sentence explains most of the arguments you will read online.
Why do researchers trust the Big Five?
Because it started from data, not from a theory about how minds ought to be organized.
Stanford's Graduate School of Business calls the Big Five the most widely accepted trait model of our time. Psychology Today reports that Big Five measures have been extensively validated and give continuous scores.
Continuous scores matter more than they sound. Most of us are not extreme on anything. We sit somewhere in the middle on most traits, and a scale can say so honestly.
The Big Five also has a cost. A profile like "high Conscientiousness, moderate Extraversion, lower Agreeableness" is accurate and a little dry. Nobody puts it on a mug.
What does the MBTI measure, and what does it say it doesn't?
The Myers-Briggs Company is clear about its own limits.
It says the MBTI measures preferences, not performance, and that it was not designed to describe every aspect of personality. It presents the tool as useful for self-awareness, for understanding your own needs, and for reducing miscommunication.
Read that closely. The publisher is not claiming the test predicts how well you will lead, sell or code. It is claiming the test gives you words for how you like to take in information and make decisions.
A lot of the criticism of the MBTI is really criticism of how people use it: as a hiring filter, a destiny, a reason to stop growing. Those are uses its own publisher does not endorse.
Why did your letters change when you retook it?
Because a type system draws a hard line through a soft spectrum.
Psychology Today notes that typological measures can change category when only a few responses change. Say you sit close to the middle between Thinking and Feeling. One different answer, a bad day, a different mood, and you land on the other side of the line. Your underlying self barely moved. Your label did.
The 2024 U.S. comparison reported by Scientific American found that most people sit far from either extreme on MBTI-style traits and are instead near the middle. That is exactly the situation where a binary label is shakiest.
If your letters flip, that is information. It probably means you have more range than the type name suggests.
Where does 16Personalities fit?
It is a third thing, and it gets mistaken for the MBTI constantly.
16Personalities explicitly distinguishes itself from the official MBTI, despite using a similar four-letter format. Its own theory page describes a framework that reworks Big Five-related dimensions, does not use Jungian cognitive functions, and adds an Assertive or Turbulent axis as a fifth dimension.
An outside comparison from a professional society in Japan lists its dimensions as Energy, Mind, Nature, Tactics and Identity, while the MBTI uses four preference pairs and the Big Five uses five continuous factors.
The appeal, then, is a blend: measurement inspired by the Big Five, wrapped in memorable type stories. If a result felt oddly specific and flattering, that packaging is part of why.
Which one predicts more?
The Big Five, by a clear margin in the most recent U.S. comparison we found.
In a 2024 report on 559 U.S. participants, Scientific American described the Big Five predicting 37 life outcomes about twice as accurately as an MBTI-style test. Adding the MBTI-style results did not improve predictions beyond what the Big Five already gave.
The same report found that removing Neuroticism lowered the predictive correlation from 0.23 to 0.18, a 22% drop. Neuroticism is the trait most people would happily skip. It also carries real information about how someone handles stress, which is worth sitting with if you are reading this because you are tired.
One study is one study. But the direction matches the broader picture: if you want a measurement, use the Big Five.
So should you ever use the MBTI?
Yes, if you treat it as a conversation, not a measurement.
The four preference pairs give people a shared vocabulary. "I need quiet before I decide" is easier to say when you have a word for it. The Myers-Briggs Company's own framing, self-awareness and fewer misunderstandings, is where the tool is at its most honest.
Here is a simple way to hold both:
- Take a Big Five assessment when you want to know where you stand on stable traits.
- Use MBTI language when you want a way to talk with a partner or colleague about how you each work.
- When the two disagree, trust the one that describes your behavior over the past year, not the one you like better.
- Retake nothing for a few weeks, then ask two people who know you well whether the description fits.
The research here doesn't give a verdict on running both together in any formal way, so treat this as a practical habit, not a protocol. The point is to use the numbers as a mirror, not a judge.
Can a test pick your career or your next hire?
No, and the people who study this say so plainly.
Psychology Today advises against using the MBTI for hiring, because it sorts people into discrete types and has practically no scientific evidence linking its scores to important workplace behaviors. Its broader point is that any assessment should follow a job analysis and validation for the specific role. A general type label is not a defensible substitute for evidence about the job.
If you lead a team and are weighing the two models for your organization, this comparison of MBTI and Big Five in organizations lays out how each fares in leadership settings.
If you are the one deciding your own direction, the same logic holds. A four-letter result can suggest what energizes you. It can't tell you whether to leave the job.
What does a personality test miss when you're burned out?
More than most people expect.
Psychology Today cautions that results can support self-exploration but should be handled carefully, because self-report, the wish to look good, and interpretation can all make them inaccurate. Now add exhaustion. Someone running on something that is starting to feel less like fuel and more like fumes answers every question differently than they did two years ago.
Picture a director who took a personality test during her third straight quarter of twelve-hour days. It said she was an organized, agreeable, people-first type. She read that as proof that saying no was against her nature. A year later, rested, she answered the same questions differently. This is an illustration, not a client story. But the pattern is common: the test caught her state, and she mistook it for her self.
That is the risk with any assessment. It describes how you answered on a given day. It does not know what you were carrying that day.
What should you do with your result?
Ask it a smaller question.
Instead of "who am I?", try "where in my week does this description cost me something?" If you score high in Agreeableness, look at where you say yes while your stomach says no. If your type says you prefer structure, look at what happens when your calendar has none left.
Those are questions about boundaries and self-trust, and a test can't answer them. Our free Clarity Call is one place to work through them with a person instead of a score. You can book it here.
If you want to keep reading on this, our piece on DiSC versus MBTI covers another popular assessment, and building trust in yourself starts with one small promise instead of a label.
Where does a test end and coaching begin?
A test describes. Coaching asks what you will do about it.
If what you are feeling is weeks of dread rather than curiosity about your traits, our note on coaching versus therapy for high performers explains how to tell which kind of support you need. Coaching is not a substitute for medical or mental health care.
Our perspective
We see the same pattern again and again with high performers: the result gets treated as a fact about who you are, when it is a snapshot of how you answered.
A type can feel like relief at first. Finally, a name for why meetings drain you or why you can't stop planning. The trouble starts when the name becomes a rule. "I'm a Feeler, so I can't give hard feedback." "I'm agreeable, so boundaries aren't for me."
That is why our work does not start with a label. We use evidence-based, neuroscience and trauma-informed frameworks, and we start with what you are actually living: where you override yourself, what you have outsourced to other people's expectations, and what you would choose if no one were watching.
Use the Big Five if you want a steadier measurement. Use the MBTI vocabulary if it helps you talk. Then put the paper down and look at your week.
Samka
Signed,
Samka
Want help turning a result into a decision?
If your result raised more questions than it answered, start small. Our Clarity Kit is $37 and is built to help you sort what you want from what you were told to want. If you would rather work with a person, a single coaching session is $300, and the 90-Day Coaching Package is $2,500.
If boundaries are the sticking point, our Boundary Setting Coach page shows how we approach it.
Frequently asked questions
Is the Big Five better than the MBTI?
For measurement, the research favors it. Scientific American's 2024 report found the Big Five predicted life outcomes about twice as well as an MBTI-style test, and the MBTI-style results added nothing on top. For starting a conversation about preferences, the MBTI can still be useful.
Is 16Personalities the same as the MBTI?
No. 16Personalities says it is different from the official MBTI. It builds on Big Five-related dimensions, skips Jungian cognitive functions, and adds an Assertive or Turbulent axis. The four-letter format looks alike, which is why people confuse them.
Should I put my MBTI type on my resume or use it to hire?
Psychology Today advises against using the MBTI for hiring, citing practically no scientific evidence linking its scores to important workplace behaviors. If you assess candidates at all, the assessment should follow an analysis of the specific role. Your own type is better kept as a private tool for self-awareness.
My result changed when I retook the test. Which one is right?
Probably both, in the sense that you sit near the middle of a spectrum. Type systems can change category when only a few answers change. Look at what holds steady across results, and treat the rest as range.
The label can wait. Your week can't.
Sources
- How Useful Are Personality Tests? | Psychology Today
- Models of Personality | Stanford Graduate School of Business
- Personality Tests Aren't All the Same | Scientific American
- All About the Myers-Briggs (MBTI) Assessment | The Myers-Briggs Company
- MBTI vs. 16Personalities | 16Personalities
- Our Theory | 16Personalities
- Socionics, MBTI, 16Personalities and the Big Five | Socionics Association of Japan
- How to Use Personality Assessments for Smarter Hiring Decisions | Psychology Today